Tandem metathesis depolymerization and cyclopolymerization toward flexible–rigid block copolymers with unique damping properties. Issue 24 (31st May 2022)

• Record Type: Journal Article
• Authors: Zhang, Lingli; Quan, Ying; Wang, Hao; Han, Huijing; Liao, Xiaojuan; Sun, Ruyi; Xie, Meiran
• Is Part Of: Polymer chemistry. Volume 13:Issue 24(2022)
• Page Start: 3670
• Page End: 3680
• Publication Date: 2022-05-31
• Subjects: Polymers -- Periodicals; Macromolecules -- Periodicals; Polymerization -- Periodicals; 547.705
• DOI: 10.1039/d2py00521b
• Languages: English
• ISSNs: 1759-9954

Abstract

Abstract : Triblock copolymers containing shortened natural rubber segments and polyacetylene segments were synthesized by tandem metathesis depolymerization and cyclopolymerization, and modified by triazolinedione toward unique damping properties. Abstract : Metathesis depolymerization (MDP) of natural rubber (NR) was readily conducted to afford depolymerized NR ( d NR x ) bearing a living chain end, which can initiate metathesis cyclopolymerization (MCP) of 1, 6-heptadiyne monomers to yield conjugated polyacetylene (PA) derivatives, and thus block copolymers consisting of a rubbery d NR x segment and a plastic PA segment were achieved by this newly constructed tandem MDP–MCP strategy. Importantly, triblock copolymers containing a flexible d NR x segment and rigid ionic PA segment possessed good mechanical properties, and exhibited distinctive damping performance with a unique relaxation plateau covering a broad temperature range, which could be further enhanced by modifying triblock copolymers with bromo-functionalized triazolinedione derived from biobased oleic acid. Therefore, the developed MDP–MCP method should become a feasible technique with expanded applications in the remodeling of unsaturated polymers for providing flexible–rigid functional block copolymers.